/*
 * =====================================================================================
 *
 *       Filename:  firMD5.h
 *
 *    Description:  MD5校验
 *
 *        Version:  1.0
 *        Created:  2013年06月14日 00时19分49秒
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  liuxin (lx), 
 *        Company:  
 *
 * =====================================================================================
 */

#ifndef _SMD5_H
#define _SMD5_H

namespace MD5SPACE
{

	typedef unsigned char *POINTER;
	typedef unsigned short int UINT2;
	typedef unsigned long int UINT4;

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16 
#define S34 23  
#define S41 6
#define S42 10
#define S43 15
#define S44 21

	/*  F, G, H and I are basic MD5 functions.
	 *   */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define HX(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

	/*  ROTATE_LEFT rotates x left n bits.
	 *   */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

	/*  FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
	 *  Rotation is separate from addition to prevent recomputation.
	 *   */
#define FF(a, b, c, d, x, s, ac) { \
	(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
	(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
	(a) += HX ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
	(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}

	typedef struct {
		unsigned long int state[4];                                   
		unsigned long int count[2];        
		unsigned char buffer[64];                         
	} MD5_CTX;

static unsigned char PADDING[64] = {
	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};  

static void Decode (UINT4 *output,unsigned char *input,unsigned int len)
{
	unsigned int i, j;

	for (i = 0, j = 0; j < len; i++, j += 4)
		output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
			(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}

static void MD5_memset (POINTER output,int value,unsigned int len)
{
	unsigned int i;

	for (i = 0; i < len; i++)
		((char *)output)[i] = (char)value;
}
void MD5Init (MD5_CTX * context) 
{       
	context->count[0] = context->count[1] = 0;
	context->state[0] = 0x67452301;
	context->state[1] = 0xefcdab89;
	context->state[2] = 0x98badcfe; 
	context->state[3] = 0x10325476;
}

static void MD5_memcpy (POINTER output,POINTER input,unsigned int len)
{ 
	unsigned int i;

	for (i = 0; i < len; i++)
		output[i] = input[i];
} 

static void MD5Transform (UINT4 state[4],unsigned char block[64])
{
	UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

	Decode (x, block, 64);

	FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /*  1 */
	FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /*  2 */
	FF (c, d, a, b, x[ 2], S13, 0x242070db); /*  3 */
	FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /*  4 */
	FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /*  5 */
	FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /*  6 */
	FF (c, d, a, b, x[ 6], S13, 0xa8304613); /*  7 */
	FF (b, c, d, a, x[ 7], S14, 0xfd469501); /*  8 */
	FF (a, b, c, d, x[ 8], S11, 0x698098d8); /*  9 */
	FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /*  10 */
	FF (c, d, a, b, x[10], S13, 0xffff5bb1); /*  11 */
	FF (b, c, d, a, x[11], S14, 0x895cd7be); /*  12 */
	FF (a, b, c, d, x[12], S11, 0x6b901122); /*  13 */
	FF (d, a, b, c, x[13], S12, 0xfd987193); /*  14 */
	FF (c, d, a, b, x[14], S13, 0xa679438e); /*  15 */
	FF (b, c, d, a, x[15], S14, 0x49b40821); /*  16 */ 

	GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /*  17 */
	GG (d, a, b, c, x[ 6], S22, 0xc040b340); /*  18 */
	GG (c, d, a, b, x[11], S23, 0x265e5a51); /*  19 */
	GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /*  20 */
	GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /*  21 */
	GG (d, a, b, c, x[10], S22,  0x2441453); /*  22 */
	GG (c, d, a, b, x[15], S23, 0xd8a1e681); /*  23 */
	GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /*  24 */
	GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /*  25 */
	GG (d, a, b, c, x[14], S22, 0xc33707d6); /*  26 */
	GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /*  27 */
	GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /*  28 */
	GG (a, b, c, d, x[13], S21, 0xa9e3e905); /*  29 */
	GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /*  30 */
	GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /*  31 */
	GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /*  32 */ 

	HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /*  33 */
	HH (d, a, b, c, x[ 8], S32, 0x8771f681); /*  34 */
	HH (c, d, a, b, x[11], S33, 0x6d9d6122); /*  35 */
	HH (b, c, d, a, x[14], S34, 0xfde5380c); /*  36 */
	HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /*  37 */
	HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /*  38 */
	HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /*  39 */
	HH (b, c, d, a, x[10], S34, 0xbebfbc70); /*  40 */
	HH (a, b, c, d, x[13], S31, 0x289b7ec6); /*  41 */
	HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /*  42 */
	HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /*  43 */
	HH (b, c, d, a, x[ 6], S34,  0x4881d05); /*  44 */
	HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /*  45 */
	HH (d, a, b, c, x[12], S32, 0xe6db99e5); /*  46 */
	HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /*  47 */
	HH (b, c, d, a, x[ 2], S34, 0xc4ac5665);

	II (a, b, c, d, x[ 0], S41, 0xf4292244); /*  49 */
	II (d, a, b, c, x[ 7], S42, 0x432aff97); /*  50 */
	II (c, d, a, b, x[14], S43, 0xab9423a7); /*  51 */
	II (b, c, d, a, x[ 5], S44, 0xfc93a039); /*  52 */
	II (a, b, c, d, x[12], S41, 0x655b59c3); /*  53 */
	II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /*  54 */
	II (c, d, a, b, x[10], S43, 0xffeff47d); /*  55 */
	II (b, c, d, a, x[ 1], S44, 0x85845dd1); /*  56 */
	II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /*  57 */
	II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /*  58 */
	II (c, d, a, b, x[ 6], S43, 0xa3014314); /*  59 */
	II (b, c, d, a, x[13], S44, 0x4e0811a1); /*  60 */
	II (a, b, c, d, x[ 4], S41, 0xf7537e82); /*  61 */
	II (d, a, b, c, x[11], S42, 0xbd3af235); /*  62 */
	II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /*  63 */
	II (b, c, d, a, x[ 9], S44, 0xeb86d391); /*  64 */ 

	state[0] += a;
	state[1] += b;
	state[2] += c;
	state[3] += d;

	MD5_memset ((POINTER)x, 0, sizeof (x));
}

void MD5Update (MD5_CTX *context,unsigned char *input,unsigned int inputLen)
{
	unsigned int i, index, partLen;

	index = (unsigned int)((context->count[0] >> 3) & 0x3F);

	if ((context->count[0] += ((UINT4)inputLen << 3))
			< ((UINT4)inputLen << 3))
		context->count[1]++;
	context->count[1] += ((UINT4)inputLen >> 29);

	partLen = 64 - index;

	if (inputLen >= partLen) {
		MD5_memcpy
			((POINTER)&context->buffer[index], (POINTER)input, partLen);
		MD5Transform (context->state, context->buffer);

		for (i = partLen; i + 63 < inputLen; i += 64)
			MD5Transform (context->state, &input[i]);

		index = 0;
	}
	else
		i = 0;

	MD5_memcpy
		((POINTER)&context->buffer[index], (POINTER)&input[i],
		 inputLen-i);
}


static void Encode (unsigned char *output,UINT4 *input,unsigned int len)
{           
	unsigned int i, j;

	for (i = 0, j = 0; j < len; i++, j += 4) {
		output[j] = (unsigned char)(input[i] & 0xff);
		output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
		output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
		output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
	}
}  

void MD5Final (unsigned char digest[16], MD5_CTX *context)
{       
	unsigned char bits[8];
	unsigned int index, padLen;

	Encode (bits, context->count, 8);

	index = (unsigned int)((context->count[0] >> 3) & 0x3f);
	padLen = (index < 56) ? (56 - index) : (120 - index);
	MD5Update (context, PADDING, padLen);

	MD5Update (context, bits, 8);

	Encode (digest, context->state, 16);

	MD5_memset ((POINTER)context, 0, sizeof (*context));
}

bool MD5Data(const void* pData,size_t size,unsigned char *pMD5 /*  16 Byte*/)
{
	MD5_CTX context;
	MD5Init (&context);
	MD5Update (&context, (unsigned char*)pData, size);
	MD5Final (pMD5, &context);
	return true;
}

};

#endif
